Measurement of jet fragmentation into charged particles in $pp$ and PbPb collisions at $\sqrt{s_{NN}}=2.76$ TeV

Chatrchyan, Serguei

doi:10.1007/JHEP10(2012)087

Title: Measurement of jet fragmentation into charged particles in $pp$ and PbPb collisions at $$\sqrt{s_{NN}}=2.76$$ TeV

Journal Article · Tue May 01 00:00:00 EDT 2012 · JHEP

DOI:https://doi.org/10.1007/JHEP10(2012)087· OSTI ID:1424706

Chatrchyan, Serguei

Jet fragmentation in pp and PbPb collisions at a centre-of-mass energy of 2.76 TeV per nucleon pair was studied using data collected with the CMS detector at the LHC. Fragmentation functions are constructed using charged-particle tracks with transverse momenta pt > 4 GeV for dijet events with a leading jet of pt > 100 GeV. The fragmentation functions in PbPb events are compared to those in pp data as a function of collision centrality, as well as dijet-pt imbalance. Special emphasis is placed on the most central PbPb events including dijets with unbalanced momentum, indicative of energy loss of the hard scattered parent partons. The fragmentation patterns for both the leading and subleading jets in PbPb collisions agree with those seen in pp data at 2.76 TeV. The results provide evidence that, despite the large parton energy loss observed in PbPb collisions, the partition of the remaining momentum within the jet cone into high-pt particles is not strongly modified in comparison to that observed for jets in vacuum.

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Research Organization:: Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States); Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States); Argonne National Lab. (ANL), Argonne, IL (United States)

Sponsoring Organization:: USDOE Office of Science (SC), High Energy Physics (HEP)

Contributing Organization:: CMS

DOE Contract Number:: AC02-07CH11359

OSTI ID:: 1424706

Report Number(s):: FERMILAB-PUB-12-714-CMS; CMS-HIN-11-004; CERN-PH-EP-2012-143; arXiv:1205.5872; 1116250

Journal Information:: JHEP, Vol. 1210

Country of Publication:: United States

Language:: English

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